<template>
  <div id="app">
    <!-- v-slot用来接收相应的组件 -->
    <router-view class="router-view" v-slot="{Component}"> 
      <transition :name="transitionName">
        <component :is="Component" />
      </transition>
    </router-view>
  </div>
</template>
<script>
import { toRefs } from 'vue'
import {useRouter} from 'vue-router'
export default {
  setup(){
    const router = useRouter()
    const state={
      transitionName:'slide-left'
    }
    router.beforeEach((to,from)=>{
      console.log(to,from);
      // 过渡动画
      if(to.meta.index > from.meta.index){
        state.transitionName = 'slide-left'
      }else if(to.meta.index < from.meta.index){
        state.transitionName = 'slide-right'
      }else{
        state.transitionName = ''
      }
    })
    return {
      ...toRefs(state)
    }
  }
}
</script>
<style lang="less">
html, body {
  height: 100%;
  overflow-x: hidden;
  overflow-y: scroll;
}
#app {
  height: 100%;
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  // text-align: center;
  color: #2c3e50;
}

.router-view{
    width: 100%;
    height: auto;
    position: absolute;
    top: 0;
    bottom: 0;
    margin: 0 auto;
    -webkit-overflow-scrolling: touch;
}

.slide-right-enter-active,
.slide-right-leave-active,
.slide-left-enter-active,
.slide-left-leave-active{
    height: 100%;
    will-change: transform;
    transition: all 500ms;
    position: absolute;
    backface-visibility: hidden;
}
.slide-right-enter{
    opacity: 0;
    transform: translate3d(-100%, 0, 0);
}
.slide-right-leave-active{
    opacity: 0;
    transform: translate3d(100%, 0, 0);
}
.slide-left-enter{
    opacity: 0;
    transform: translate3d(100%, 0, 0);
}
.slide-left-leave-active{
    opacity: 0;
    transform: translate3d(-100%, 0, 0);
}

.van-badge—fixed {
  z-index: 1000;
}
</style>
